| 1. | A fusion algorithm for distributed underwater signal detection
一种分布式水声信号检测系统的融合算法 |
| 2. | The passive recognition technology of underwater targets is always a hot topic in the field of underwater signal processing
水下目标被动识别技术一直是水声信号处理领域研究的热点。 |
| 3. | During underwater signal processing , parameter estimation and target identification are two kinds of important problems
在水下信号处理中，参数估计和目标识别是两类非常重要的问题。 |
| 4. | Finally , the study gives itself plan about information fusion of position system and underwater signal , tallying the measured data of time , position and depth with ground mark
最后，对定位系统与水声信号之间的信息融合问题给出了自己的方案，使得时间、方位、深度的测试数据与地面标记有良好的吻合。 |
| 5. | On the other hand , the resolution of wavelet is adapted in time - frequency plane and the structure of wavelet transform is similar to that of wide - band correlation processing . so wavelet transform is an important tool in future underwater signal processing
小波变换具有在时频平面内自适应调整单元分辨率、与宽带相关处理结构相似等优点，使得它在非平稳和宽频带信号处理中起着非常重要的作用。 |
| 6. | The underwater acoustic channel is very complex where cochannel interference , doppler frequency offsets , narrow bandwidth and time and frequency selective deep fades obstructs the development of high speed and fidelity underwater data transmissions . thus projects of high speed and fidelity underwater signal transmissions become a hotspot in the fields of world academic circles . the conventional serial communication must use adaptive equalizer to combat the multipath in real - time
海洋水声信道是一种极其复杂多变的时-空-频变参信道，其信道窄，强多途干扰，信号起伏衰落严重，一直是水下信息可靠高速传输的主要障碍，因此如何在水声信道中高速率准确地传输数据，就成为世界性的热门课题。 |
| 7. | The target locating is a classic and important problem of the underwater signal processing . based on the theory of array signal processing , the paper is devoted to the study of the theories and application technologies of doa estimation and underwater array signal processing in a systematic and detailed way , especially on the design of the digital multi - beamforming system
目标定向技术是水下信号处理研究的经典问题和重要方向，本文以目标定向和阵列处理理论为基础，从实际应用出发，系统研究了水下目标定向和阵列信号处理的相关理论和实现技术，包括阵列信号处理的基本理论，数字多波束系统的设计。 |
| 8. | These years wavelet theory has been widely applied in underwater signal processing . whereas its excellent time - frequency localization , this dissertation takes continuous wavelet transform ( cwt ) as research tool and devoted to systematic research and deep exploration of two aspects in underwater signal processing field - estimation of parameters and target classification and identification
近年来小波分析在水下信号处理方面的应用得到了长足的发展，鉴于其良好的时频局部化特点，本文将基于连续小波变换的时频分析作为工具，就参数估计和目标识别两方面的问题做了系统研究和深入探讨。 |
| 9. | The " simple " method based on cwt is inducted to underwater signal processing to estimate the instantaneous frequency of echo . in essential , this method is to extract the wavelet ridge from the maximum of continuous wavelet transform , according to the corresponding relationship between wavelet ridge and signal frequency , finally to obtain the estimated instantaneous frequency
文中将基于连续小波变换的‘ simple ’方法引入到水下信号的瞬时频率估计中来，也即通过寻求连续小波变换幅值的最大值来得到小波脊，再根据小波脊与信号频率之间的对应关系，最终完成信号的瞬时频率估计。 |
| 10. | Higher capabilities were put forward for detection , identification and anti - interference of torpedo in future naval battle . compared with the narrow - band processing , wide - band processing is a new direction for underwater signal processing for its advantages including abundant information of wide - band echo and little correlation of reverberation
未来海战对鱼雷在探测目标、识别目标和反对抗能力方面提出了更高的要求，而宽频带回波信号具有携带目标信息量大，混响背景相关性弱，利于检测、识别目标等优点，因此自导系统发展的方向是宽频带自导。 |
